Here is the full list of all 53 Gamedec achievements.
The base game contains 52 achievements, and there is 1 DLC pack containing 1 achievements.
Help Starlett get out of limbo.
Agree with the simulation owners
Lock 3 characters in the loop in Paradise Beach.
Get to the Paradise Beach.
Find Bliss in Axis Mundi.
Unlock all codebreaker modes.
Find the Harvest Time rift.
Find the Panda's diorama in Axis Mundi.
Find Morty the robot in Axis Mundi.
Visit 15 different locations in Axis Mundi.
Break out of the prison.
Get to the Umbra's House.
Collect 10 iron.
Gather 3 Poteto Gomuins in Knight's Code.
Get the maximum profession tier in at least two paths in one playthrough.
Create Ken's V-Ghost from his psychoscan.
Gain Sleeves respect in the bar.
Gain Trolls respect in the bar.
Order a whiskey at Yet's bar.
Explore all death hypotheses in Fallen Hero.
Search all the trash bins in Fallen Hero.
Help the Bandit escape in Harvest Time.
Win a gun duel with the sheriff.
Get a gun in Harvest Time.
Use your deduction at least 15 times.
Find two ways to reach the graveyard.
Get 5000 Harvest Time's coins.
Get 50 information for deduction.
Listen to the 3 tales from the Rusty Ed.
Fully expand your farm in Harvest Time.
Reach the Farm Level 5 in Harvest Time.
Obtain the maximum profession tier.
Help Fredo in Like Father Like Son.
Complete the solitaire in Haggis' office.
Help Ramon to force another player out from Twisted & Perverted.
Get 20 aspects.
Get 50 pieces of information for the codex.
Scratch Haggis' golden frame.
Complete all the fetchquests from Troll King.
Surprise Jester in the theater.
Find all the clues written on the boards.
Meet the diginet in the street.
Use the brainfix on yourself.
Use the cat go through the gate.
Do 5 quests for the Clan Masters in Knight's Code.
Collect 3 memories of Ken.
Create 5 items in the Forge in Knight's Code.
Help Rhonda find her son.
Gather a team of at least 3 people.
Destroy the simulation
Escape from the simulation.
Make Ken a pretty straightforward proposal.